Jack sat on the fence for a week last spring before he finally joined the track team instead of the baseball team.
去年春天杰克犹豫了一周，最后才加入田径队而没参加捧球队。
The emergency escape device for high rise building consists of jack ladder, guide track, chain wheel, speed varying mechanism, hydraulic speed regulating controller, etc.
本发明是一种高层建筑遇险时紧急逃生装置，也是一种理想的消防设施。该装置主要由链梯、导轨基架、链轮、变速机构、液压调速式控制器等组成。
The emergency escape device for high rise building consists of jack ladder, guide track, chain wheel, speed varying mechanism, hydraulic speed regulating controller, etc.
本发明是一种高层建筑遇险时紧急逃生装置，也是一种理想的消防设施。该装置主要由链梯、导轨基架、链轮、变速机构、液压调速式控制器等组成。
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